If you need to set up your email account manually, make sure that you have the email settings for your account. Incoming and outgoing mail server details and respected ports too.
- Go to Settings > Passwords & Accounts.
- Tap Add Account, tap Other, then tap Add Mail Account.
- Enter your name, email address, password, and a description for your account.
- Tap Next. Mail will try to find the email settings and finish your account setup. If Mail finds your email settings, tap Done to complete your account setup.